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Finding the Fourth Proportional to 716,639.80, 988,879.98 and 490,617.40

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Solution

The fourth proportional to 716,639.80, 988,879.98 and 490,617.40 is: 676,995.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,639.80 : 988,879.98 = 490,617.40 : x
  2. Step 2: Convert to fraction form
    716,639.80/988,879.98 = 490,617.40/x
  3. Step 3: Cross multiply
    716,639.80x = 988,879.98 × 490,617.40
  4. Step 4: Simplify right side
    716,639.80x = 485,161,724,699.65
  5. Step 5: Solve for x
    x = 485,161,724,699.65/716,639.80
  6. Step 6: Final answer
    x = 676,995.23

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.